@wordpress/block-editor/build/components/block-list/use-block-props/use-focus-first-element.js

Generic block editor.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useFocusFirstElement = useFocusFirstElement;

var _lodash = require("lodash");

var _element = require("@wordpress/element");

var _dom = require("@wordpress/dom");

var _data = require("@wordpress/data");

var _dom2 = require("../../../utils/dom");

var _store = require("../../../store");

/**
 * External dependencies
 */

/**
 * WordPress dependencies
 */

/**
 * Internal dependencies
 */

/** @typedef {import('@wordpress/element').RefObject} RefObject */

/**
 * Returns the initial position if the block needs to be focussed, `undefined`
 * otherwise. The initial position is either 0 (start) or -1 (end).
 *
 * @param {string} clientId Block client ID.
 *
 * @return {number} The initial position, either 0 (start) or -1 (end).
 */
function useInitialPosition(clientId) {
  return (0, _data.useSelect)(select => {
    const {
      getSelectedBlocksInitialCaretPosition,
      isMultiSelecting,
      isNavigationMode,
      isBlockSelected
    } = select(_store.store);

    if (!isBlockSelected(clientId)) {
      return;
    }

    if (isMultiSelecting() || isNavigationMode()) {
      return;
    } // If there's no initial position, return 0 to focus the start.


    return getSelectedBlocksInitialCaretPosition();
  }, [clientId]);
}
/**
 * Transitions focus to the block or inner tabbable when the block becomes
 * selected and an initial position is set.
 *
 * @param {string} clientId Block client ID.
 *
 * @return {RefObject} React ref with the block element.
 */


function useFocusFirstElement(clientId) {
  const ref = (0, _element.useRef)();
  const initialPosition = useInitialPosition(clientId);
  (0, _element.useEffect)(() => {
    if (initialPosition === undefined || initialPosition === null) {
      return;
    }

    if (!ref.current) {
      return;
    }

    const {
      ownerDocument
    } = ref.current; // Do not focus the block if it already contains the active element.

    if (ref.current.contains(ownerDocument.activeElement)) {
      return;
    } // Find all tabbables within node.


    const textInputs = _dom.focus.tabbable.find(ref.current).filter(node => (0, _dom.isTextField)(node)); // If reversed (e.g. merge via backspace), use the last in the set of
    // tabbables.


    const isReverse = -1 === initialPosition;
    const target = (isReverse ? _lodash.last : _lodash.first)(textInputs) || ref.current;

    if ( // Don't focus inner block or block appenders.
    !(0, _dom2.isInsideRootBlock)(ref.current, target) || target.closest('.block-list-appender')) {
      ref.current.focus();
      return;
    }

    (0, _dom.placeCaretAtHorizontalEdge)(target, isReverse);
  }, [initialPosition]);
  return ref;
}
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